March 2021
Disproportionality Index: a measure of fair representation
\[\frac{\%_{Group\: X; \:salary\: range \: i}}{\% _{All \:Employees; \:salary\: range \: i}} = DI _{Group\:X; \:salary\:range\:i}\]
\[ DI_{Black \: employees; <60K } =\frac{23.3\%}{16.7\%} = 1.40\]
Below are the values used to create the figures.
| All Employees | Black Employees | All Visible Minority Employees | Non-Visible Minority Employees | Indigenous Employees | Employees with Disabilities | ||||||
Salary Range | Percent | DI | Percent | DI | Percent | DI | Percent | DI | Percent | DI | Percent | DI |
Less than $60,000 | 16.70 | 1 | 23.53 | 1.41 | 17.70 | 1.06 | 16.47 | 0.99 | 17.91 | 1.07 | 18.54 | 1.11 |
$60,000 to $69,999 | 17.56 | 1 | 23.86 | 1.36 | 19.67 | 1.12 | 17.06 | 0.97 | 18.61 | 1.06 | 19.31 | 1.10 |
$70,000 to $84,999 | 23.14 | 1 | 20.94 | 0.90 | 22.07 | 0.95 | 23.39 | 1.01 | 24.46 | 1.06 | 21.07 | 0.91 |
$85,000 to $99,999 | 19.30 | 1 | 15.72 | 0.81 | 18.68 | 0.97 | 19.45 | 1.01 | 21.97 | 1.14 | 19.19 | 0.99 |
Over $100,000K | 23.30 | 1 | 15.72 | 0.67 | 21.69 | 0.93 | 23.67 | 1.02 | 17.05 | 0.73 | 21.90 | 0.94 |
All ranges | 100.00 | 1 | 100.00 | 1.00 | 100.00 | 1.00 | 100.00 | 1.00 | 100.00 | 1.00 | 100.00 | 1.00 |
The dotted line represents equitable representation. It can been seen that Black employees are overrepresented at the lower salary ranges and underrepresented at higher ranges compared to the other groups. As can be seen by the “All Non-Minority Employees” bars, an equal DI across all salary ranges should be expected.
This plot zooms in on our “baseline” group and compares it to the Black employee group, which appears to be the most affected by inequity. A steady decrease in representation with each increase in salary range is clearly visible for the Black employee group.